Red Seal Plumbing Practice Exam

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A/an _________ is a positively charged ion in solution.

  1. cation

  2. anion

  3. proton

  4. neutron

The correct answer is: cation

An anion is a negatively charged ion in solution, which means it cannot be an option. A proton is a positively charged particle within an atom, but it does not refer to a positively charged ion in solution. A neutron is an uncharged particle within an atom, so it cannot be an option. Therefore, cation is the only correct option as it specifically refers to a positively charged ion in solution.

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